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```408

Efficiency: Double Riveting.

The Efficienc7 of joint has been already mentioned, and
its \alue,     .

__ strength of pierced plate _ p" — dl
strength of solid plate         /'

for single riveted joint,

with f " plate,   ij =

1*09

1-09 4-*8
1*09

= '57 or 57%

and    with i" plate,   rj = - f — =^45 or 45%

-            -

The Strength of a Double-riveted Lap Joint (zigzag)
can easily be discussed by reference to the * virtual links ' in Fig.
357. Clearly plate A must equal one rivet, while E equals two
rivets, in strength. So the centres at A will be 1*094- d^ while
those at B (called the pitch),

p"= 2 (1-09)+^= 2-

and

The distance from rivet centre to plate edge mil be ri </as
before, deduced from practice

___o

: and the efficiency t\ =

|" platen = 2.*% + .s = 73 or 73%

Example 12. — Find the various dimensions of lap joints for f"
boiler plates; (i) ; single riveted, and (2) double riveted,

(i)

f and ^=-

and the joint is drawn at Fig. 358.```